diff --git a/src/stc/scintilla/include/Scintilla.h b/src/stc/scintilla/include/Scintilla.h
index 3cc7dd1bf7..22d36d34d9 100644
--- a/src/stc/scintilla/include/Scintilla.h
+++ b/src/stc/scintilla/include/Scintilla.h
@@ -42,17 +42,6 @@ typedef long sptr_t;
 
 typedef sptr_t (*SciFnDirect)(sptr_t ptr, unsigned int iMessage, uptr_t wParam, sptr_t lParam);
 
-/* Workaround for building with MinGW (not MinGW-w64) in strict ANSI mode which
- * is, notably, enabled by -std=c++NN options. */
-#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) && defined(__STRICT_ANSI__)
-/* Other headers included by an application using Scintilla might already
- * define isascii() too, for the same reasons, try to play nicely with the. */
-#ifndef isascii
-inline int isascii(int c) { return !(c & ~0x7F); }
-#define isascii isascii
-#endif
-#endif
-
 /* ++Autogenerated -- start of section automatically generated from Scintilla.iface */
 #define INVALID_POSITION -1
 #define SCI_START 2000